code: def _get_categories(self) -> List[str]:
      return self.corpus.get_categories()
  
file_path: scattertext/scattertext/categorygrouping/characteristic_grouper.py
imports: from typing import List, Optional, Callable, Dict, Tuple
  import pandas
  import numpy
  from scipy.stats import spearmanr
  from tqdm.auto import tqdm
  from scattertext.TermDocMatrix import TermDocMatrix
  from scattertext.categorygrouping.characteristic_embedder_base import CategoryEmbedderABC
  from scattertext.categorygrouping.rank_embedder import RankEmbedder
label_desc: Use image node_id 6 for calling the CharacteristicGrouper obj's underlying member method code with example usage: obj._get_categories() and returns: self